Score tomatoes crosswise and place in hot water until the skin peeled off easily. Then cut the peeled tomatoes into cubes. Peel and core the apples and also dice them.
Heat some oil in a pan and let the finely chopped onion cubes tarnish. Put the tomato cubes, apple cubes and soup cubes in the pan and let simmer for about 10 minutes on a low flame (gourmet tip: a dash of white wine enhances the aroma). In the meantime, marinate the fish fillets with lemon juice, season with salt and also add to the pan. Now add 1 tablespoon of sour cream to the fish and cook for another 10 minutes.
Sprinkle with parsley, chives or cress and serve.
Boiled potatoes and various salads go well as a side dish.